Spell check is a feature found in many word processing programs and text editors that automatically checks the spelling of words as you type. It highlights any misspelled words, allowing users to correct them easily. This tool helps improve writing accuracy and ensures that documents are professional and clear. Most spell check systems use a built-in dictionary to compare the words you type against a list of correctly spelled words. If a word is not recognized, it may suggest alternatives or allow you to add the word to the dictionary if it is a proper noun or a specialized term.